text: /* s_nexttoward.c
   * Special i387 version
   * Conversion from s_nextafter.c by Ulrich Drepper, Cygnus Support,
   * drepper@cygnus.com.
   */
  
  /*
   * ====================================================
   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   *
   * Developed at SunPro, a Sun Microsystems, Inc. business.
   * Permission to use, copy, modify, and distribute this
   * software is freely granted, provided that this notice
   * is preserved.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static char rcsid[] = "$NetBSD: $";
  #endif
  
  /* IEEE functions
   *	nexttoward(x,y)
   *	return the next machine floating-point number of x in the
   *	direction toward y.
   *   Special cases:
   */
  
  #include <errno.h>
  #include <math.h>
  #include <math-barriers.h>
  #include <math_private.h>
  #include <float.h>
  
  double __nexttoward(double x, long double y)
  {
  	int32_t hx,ix,iy;
  	uint32_t lx,hy,ly,esy;
  
  	EXTRACT_WORDS(hx,lx,x);
  	GET_LDOUBLE_WORDS(esy,hy,ly,y);
  	ix = hx&0x7fffffff;		/* |x| */
  	iy = esy&0x7fff;		/* |y| */
  
  	/* Intel's extended format has the normally implicit 1 explicit
  	   present.  Sigh!  */
  	if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) ||   /* x is nan */
  	   ((iy>=0x7fff)&&((hy&0x7fffffff)|ly)!=0))        /* y is nan */
  	   return x+y;
  	if((long double) x==y) return y;	/* x=y, return y */
  	if((ix|lx)==0) {			/* x == 0 */
  	    double u;
  	    INSERT_WORDS(x,(esy&0x8000)<<16,1); /* return +-minsub */
  	    u = math_opt_barrier (x);
  	    u = u * u;
  	    math_force_eval (u);		/* raise underflow flag */
  	    return x;
  	}
  	if(hx>=0) {				/* x > 0 */
  	    if (x > y) {			/* x -= ulp */
  		if(lx==0) hx -= 1;
  		lx -= 1;
  	    } else {				/* x < y, x += ulp */
  		lx += 1;
  		if(lx==0) hx += 1;
  	    }
  	} else {				/* x < 0 */
  	    if (x < y) {			/* x -= ulp */
  		if(lx==0) hx -= 1;
  		lx -= 1;
  	    } else {				/* x > y, x += ulp */
  		lx += 1;
  		if(lx==0) hx += 1;
  	    }
  	}
  	hy = hx&0x7ff00000;
  	if(hy>=0x7ff00000) {
  	  double u = x+x;			/* overflow  */
  	  math_force_eval (u);
  	  __set_errno (ERANGE);
  	}
  	if(hy<0x00100000) {
  	    double u = x*x;			/* underflow */
  	    math_force_eval (u);		/* raise underflow flag */
  	    __set_errno (ERANGE);
  	}
  	INSERT_WORDS(x,hx,lx);
  	return x;
  }
  weak_alias (__nexttoward, nexttoward)
  #ifdef NO_LONG_DOUBLE
  strong_alias (__nexttoward, __nexttowardl)
  weak_alias (__nexttoward, nexttowardl)
  #endif
  